Once he entered the dusty ancient storybook, Xie Yanci became the female supporting character in the book who was destined to die tragically. Strange murders occur one after another on the streets of Chang'an, and the dead are all related to the lost "two-dimensional picture scroll" - the characters in the picture scroll can actually be reflected in reality, and every time a murder occurs, there will be an extra bloody ink mark on the picture scroll. As a marginal female supporting character in the novel, Xie Yanci originally wanted to stay away from the main plot to save her life, but was accidentally involved in a series of murders: whispers of picture scrolls came from the ghost market in the middle of the night, and the sealed files in Dali Temple were missing. Even the current prince was inextricably linked to the picture scrolls. Holding half of the incomplete book of tricks, she is dealing with the intertwined two-dimensional illusion of fiction and reality and the reality of Chang'an. She must not only avoid the fate of the male and female protagonists of the original book, but also find out the mastermind behind the manipulation of the scroll and the murder. Every step of the investigation was startling, as seemingly unrelated clues connected a conspiracy spanning ten years, and she discovered that her identity as the female supporting role was the only key to unlocking the conspiracy in Chang'an. When the truth about the picture scroll comes to light, Xie Yanci realizes that the so-called fate of the female partner is just a chess piece set by others. Only by solving the mystery can one escape from fate and survive against the odds.